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Eastside Mine <br />Summary of 1990 Hydrology Monitoring <br />Extent of Mining <br />No significant advances were made in 1990. The entries of the Eastside Mine <br />are advanced a total of 1100 feet. Three entries are driven on the strike. <br />Flow and Field Parameters <br />The flow and field parameters of the Harvey Gap Outlet above and below the <br />mine continue to demonstrate the seasonal discharges from the Harvey Gap <br />Reservoir. No ,significant deviations from the 1984-1989 data are noted. <br />Chemical Parameters <br />The chemical parameter results of the Harvey Gap Outlet above the mine and <br />below the mine fall within the ranges established in 1984-1989. The slight <br />increase in conductivity for the present year could be due to the rising <br />water level of the reservoir after the water level was drained to base <br />level during the irrigation season. <br />The 1990 mine water discharge results are quite similar to those for 1987, <br />1988, and 1989. This would be expected due to the small overall advancement <br />of the entries. <br />Impacts on Surface and Ground Water <br />No discharge has occurred from the sediment pond SP-1. <br />The hydrology monitoring data are listed on the attached tables found in <br />the Data and Statistical Information section beginning on page 5. A <br />comparison of 1990 data with 1984-1989 data indicates no impacts on <br />ground or surface water have occurred due to mining. <br />3 <br />